today, vehicular ad-hoc network between automobiles has been accepted by the public, and many people are interested in exchanging information with other vehicles as well as with roadside equipment while driving. when a number of vehicles want to access to the data stored in rsu ,the priority of servicing comes into face .in this case, some  methods, such as d*s, d*s/n,  have been presented so f...

The roadside unit (RSU) plays an important role in VANET environments for privacy preservation. In order to conserve the privacy of a vehicle, the issued certificate must be updated frequently via RSUs. If a certificate expires without being updated, the services for the vehicle will be terminated. Therefore, deploying as more as possible RSUs ensures that the certificate can be updated before ...

This paper establishes a new mobile electronic toll collection (m-ETC) by integrating mobile communication with radio frequency (RF) communication on microprocessor control with an e-commerce business model. A simple ETC system architecture and protocol for e-transactions from vehicles to toll stations is proposed to complete toll interaction on wireless environment. A software flow through Int...

Roadside Unit (RSU) in Vehicular Ad-hoc Network (VANET) is an essential unit usually placed at intersections to collect and analyze traffic data given from smart vehicles. Due to the costs of RSU setup, effective RSU allocation is one of important issues in VANET. In this paper, we provide an optimal RSU allocation algorithm with a concept of intersectionconnectivity between intersections. We i...

Today, vehicular Ad-hoc Network between automobiles has been accepted by the public, and many people are interested in exchanging information with other vehicles as well as with roadside equipment while driving. When a number of vehicles want to access to the data stored in RSU ,the priority of servicing comes into face .In this case, some  methods, such as D*S, D*S/N,  have been presented ...

In the vehicular ad hoc networks (VANET), various authentication schemes have been proposed for secure communications. However, the previous schemes are inefficient because each vehicle needs to share and keep a large number of session keys for communicating with the other vehicles on the VANET. To overcome the above drawback, we propose a new authenticated communication scheme for the VANET. I...

Studies were conducted on vehicular ad-hoc network (VANET) in recent years. VANET is a network that combines on-board wireless equipment (On-Board Unit, OBU) and roadside fixed wireless equipment (Road Side Unit, RSU) through wireless communication technology. When vehicles broadcast messages, the traditional systems usually use RSU to do message authentication that we can ensure messages are i...

Today, vehicular Ad-hoc Network between automobiles has been accepted by the public, and many people are interested in exchanging information with other vehicles as well as with roadside equipment while driving. When a number of vehicles want to access to the data stored in RSU ,the priority of servicing comes into face .In this case, some  methods, such as D*S, D*S/N,  have been presented ...

Major goal of the Vehicular Ad-Hoc Network (VANET) is to improve road safety and driving comfort. VANET cannot guarantee timely detection of dangerous road conditions. For addressing such problem, we proposes a new scenario using VANET, with Roadside Sensor Unit (RSU) connected to base stations(BS), every vehicles on the road can communicate to server via base station. The sensor nodes along th...

Based on communication and cooperation between vehicles and roadside infrastructure, Intelligent Transport Systems (ITS) safety applications offer great potential to avoid traffic accidents or at least reduce their impact. As these applications usually are delay-sensitive, the delay introduced by waiting for access to the wireless communication channel should both be reduced and provided with a...